Chapter 7 Outline
Objectives
Find the confidence interval for the mean when s is known or n > 30.
Determine the minimum sample size for finding a confidence interval for the mean.
Find the confidence interval for the mean when s is unknown and n < 30.
Objectives (cont'd.)
Find the confidence interval for a proportion.
Determine the minimum sample size for finding a confidence interval for a proportion.
Find a confidence interval for a variance and a standard deviation.
Introduction
Estimation is the process of estimating the value of a parameter from information obtained from a sample.
Three Properties of a Good Estimator
The estimator should be an unbiased estimator. That is, the expected value or the mean of the estimates obtained from samples of a given size is equal to the parameter being estimated.
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